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Finding the Fourth Proportional to 955.06, 1,318.02 and 721.78

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Solution

The fourth proportional to 955.06, 1,318.02 and 721.78 is: 996.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.06 : 1,318.02 = 721.78 : x
  2. Step 2: Convert to fraction form
    955.06/1,318.02 = 721.78/x
  3. Step 3: Cross multiply
    955.06x = 1,318.02 × 721.78
  4. Step 4: Simplify right side
    955.06x = 951,320.48
  5. Step 5: Solve for x
    x = 951,320.48/955.06
  6. Step 6: Final answer
    x = 996.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.